package com.外观模式;

public class Projecter {

    private static Projecter projecter=new Projecter();

    public static Projecter getInstance(){
        return projecter;
    }

    public void on(){
        System.out.println("投影仪打开了..........");
    }

    public void off(){
        System.out.println("投影仪关闭了..........");
    }

    public void focus(){
        System.out.println("投影仪正在聚焦 ..........");
    }
}
